低分辨雷達目標成像的橫向距離定標
A New Method of Cross-Range Scaling of Low Resolution Radar.
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摘要: 確定低分辨雷達目標橫向成像的距離定標(橫向距離因子),是正確獲取目標橫向距離像和進行雷達目標識別的一個前提。根據逆合成孔徑雷達(ISAR)原理,目標橫向距離因子取決于雷達波長和目標對于雷達視線(RLOS)在相干處理時間內的轉角,前者可已知,但對于非合作的運動目標,后者在簡單的ISAR方式下,是難以確定的。該文根據合成陣列以及干涉SAR(INSAR)的原理,利用兩個水平方向放置的天線,通過對兩個天線所成一維橫向距離像進行比相,便可對目標進行橫向定標。通過理論分析和仿真實驗證明,該方法是正確和有效可行的。Abstract: Cross-range scaling of low-resolution radar is very important to obtain correctly cross-range image and target classification and recognition. According to the technology of in-verse synthetic aperture radar(ISAR), the cross-range scale depends on both radar wavelength and rotating angle of target relative to radar-line-of-sight(RLOS) during the coherent accumu-lation. The former is known while the latter is difficult to determine especially in the case of ISAR. In this paper, a new approach is proposed which is based on the principle of synthetic array and interferometric inverse synthetic aperture. The phase difference of some scatters between two instant cross-range images by two antennae which are placed on one level, can be calculated. The proposed algorithm is applied to the emulational data of two antennae. The theoretical analysis and the processing results show that the proposed method is correct and effective.
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